Build a GPT for Invoice Coding Suggestions

Ask for a proposed category with evidence, a confidence flag, and an exception queue for unfamiliar charges. Keep posting permission separate.

Published September 22, 2026 · Dr. Connor Robertson

What to provide

Chart of accounts, approved vendor list, prior coding examples, and invoice images or text.

Starting prompt

Suggest an account code for each invoice line using our approved chart and examples. Show the matching rule and flag new vendors or ambiguous charges; do not post entries.

Trial case

Include an invoice line that could fit two expense codes. The GPT should show both candidates and the missing evidence; a finance reviewer makes the final coding choice.

Review gate

A bookkeeper verifies the vendor, amount, tax treatment, and account before any entry is recorded.

How to score the result

Manual recoding rate and exceptions correctly routed for review.

Use the current approved source and keep it available to the reviewer. Check a small set of finished outputs against the previous process before adopting this workflow.

Related workflows

Explore Custom GPTs for Repeatable Business Tasks or the AI business strategy guide.